tree-cfg.h: Rename from tree-flow.h.

tree-cfg.h: Rename from tree-flow.h.

	* tree-cfg.h: Rename from tree-flow.h.  Remove #includes.
	* tree-ssa.h: Relocate required #includes from tree-cfg.h.
	* tree-ssa-operands.h: Remove prototype.
	* tree-ssa-operands.c (virtual_operand_p): Move to gimple.c.
	* gimple.c (virtual_operand_p): Relocate from gimple.c.
	* gimple.h: Add prototype.
	* gimple-ssa.h: Include tree-ssa-operands.h.
	* tree-dump.c: Add tree-cfg.h to include list.
	* tree-ssa-alias.c: Add ipa-reference.h to include list.
	* config/alpha/alpha.c: Include gimple-ssa.h instead of tree-flow.h.
	* config/i386/i386.c: Don't include tree-flow.h.
	* config/rs6000/rs6000.c: Likewise.

	* lto/lto.c: Remove tree-flow.h from include list.

	* testsuite/g++.dg/plugin/header_plugin.c: Don't include tree-flow.h.

From-SVN: r203817